On Thursday, 17 September 2015 at 09:54:07 UTC, Chris wrote:
If I have code like this:
auto builder = appender!string;
builder ~= "Hello, World!";
builder ~= "I'm here!";
builder ~= "Now I'm there!";
the object file grows by 10-11 lines with each call to `builder
~=`. If I use this:
builder ~= format("%s", "Hello, World!");
builder ~= format("%s", "I'm here!");
builder ~= format("%s", "Now I'm there!");
The object file is more than twice as big and it grows by 20
lines with each call to `format`.
If I use
builder ~= format("%s %s %s", "Hello, World!", "I'm here!",
"Now I'm there!");
the code bloat is even worse.
There are many situation where a formatting string is
preferable to concatenation, however it adds _a lot_ of bloat.
Would a custom formatter be preferable to reduce code bloat or
should std/format.d be optimized? (Or both?)
dmd 2.067.1
-release -boundscheck=off -inline -O
Some initial bloat is expected, format is pretty big (although
twice as big is a lot, unless your original code was quite
small?). The extra bloat per call is likely due to inlining. I
would hope that dmd would spot consecutive inlining of the same
function and merge them, but perhaps it doesn't.
You could certainly make a less feature complete implementation
of format that is smaller.
Have you tried with ldc or gdc. In particular, have you tried
using ldc with --gc-sections on linux?
